libstdc++
ext/memory
1 // Memory extensions -*- C++ -*-
2 
3 // Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
4 // Free Software Foundation, Inc.
5 //
6 // This file is part of the GNU ISO C++ Library. This library is free
7 // software; you can redistribute it and/or modify it under the
8 // terms of the GNU General Public License as published by the
9 // Free Software Foundation; either version 3, or (at your option)
10 // any later version.
11 
12 // This library is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 // GNU General Public License for more details.
16 
17 // Under Section 7 of GPL version 3, you are granted additional
18 // permissions described in the GCC Runtime Library Exception, version
19 // 3.1, as published by the Free Software Foundation.
20 
21 // You should have received a copy of the GNU General Public License and
22 // a copy of the GCC Runtime Library Exception along with this program;
23 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
24 // <http://www.gnu.org/licenses/>.
25 
26 /*
27  *
28  * Copyright (c) 1994
29  * Hewlett-Packard Company
30  *
31  * Permission to use, copy, modify, distribute and sell this software
32  * and its documentation for any purpose is hereby granted without fee,
33  * provided that the above copyright notice appear in all copies and
34  * that both that copyright notice and this permission notice appear
35  * in supporting documentation. Hewlett-Packard Company makes no
36  * representations about the suitability of this software for any
37  * purpose. It is provided "as is" without express or implied warranty.
38  *
39  *
40  * Copyright (c) 1996
41  * Silicon Graphics Computer Systems, Inc.
42  *
43  * Permission to use, copy, modify, distribute and sell this software
44  * and its documentation for any purpose is hereby granted without fee,
45  * provided that the above copyright notice appear in all copies and
46  * that both that copyright notice and this permission notice appear
47  * in supporting documentation. Silicon Graphics makes no
48  * representations about the suitability of this software for any
49  * purpose. It is provided "as is" without express or implied warranty.
50  */
51 
52 /** @file ext/memory
53  * This file is a GNU extension to the Standard C++ Library (possibly
54  * containing extensions from the HP/SGI STL subset).
55  */
56 
57 #ifndef _EXT_MEMORY
58 #define _EXT_MEMORY 1
59 
60 #pragma GCC system_header
61 
62 #include <memory>
63 #include <bits/stl_tempbuf.h>
64 
65 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
66 
67  using std::ptrdiff_t;
68  using std::pair;
69  using std::__iterator_category;
70  using std::_Temporary_buffer;
71 
72  template<typename _InputIter, typename _Size, typename _ForwardIter>
73  pair<_InputIter, _ForwardIter>
74  __uninitialized_copy_n(_InputIter __first, _Size __count,
75  _ForwardIter __result, std::input_iterator_tag)
76  {
77  _ForwardIter __cur = __result;
78  __try
79  {
80  for (; __count > 0 ; --__count, ++__first, ++__cur)
81  std::_Construct(&*__cur, *__first);
82  return pair<_InputIter, _ForwardIter>(__first, __cur);
83  }
84  __catch(...)
85  {
86  std::_Destroy(__result, __cur);
87  __throw_exception_again;
88  }
89  }
90 
91  template<typename _RandomAccessIter, typename _Size, typename _ForwardIter>
92  inline pair<_RandomAccessIter, _ForwardIter>
93  __uninitialized_copy_n(_RandomAccessIter __first, _Size __count,
94  _ForwardIter __result,
95  std::random_access_iterator_tag)
96  {
97  _RandomAccessIter __last = __first + __count;
98  return (pair<_RandomAccessIter, _ForwardIter>
99  (__last, std::uninitialized_copy(__first, __last, __result)));
100  }
101 
102  template<typename _InputIter, typename _Size, typename _ForwardIter>
103  inline pair<_InputIter, _ForwardIter>
104  __uninitialized_copy_n(_InputIter __first, _Size __count,
105  _ForwardIter __result)
106  { return __gnu_cxx::__uninitialized_copy_n(__first, __count, __result,
107  __iterator_category(__first)); }
108 
109  /**
110  * @brief Copies the range [first,last) into result.
111  * @param first An input iterator.
112  * @param last An input iterator.
113  * @param result An output iterator.
114  * @return result + (first - last)
115  * @ingroup SGIextensions
116  *
117  * Like copy(), but does not require an initialized output range.
118  */
119  template<typename _InputIter, typename _Size, typename _ForwardIter>
120  inline pair<_InputIter, _ForwardIter>
121  uninitialized_copy_n(_InputIter __first, _Size __count,
122  _ForwardIter __result)
123  { return __gnu_cxx::__uninitialized_copy_n(__first, __count, __result,
124  __iterator_category(__first)); }
125 
126 
127  // An alternative version of uninitialized_copy_n that constructs
128  // and destroys objects with a user-provided allocator.
129  template<typename _InputIter, typename _Size, typename _ForwardIter,
130  typename _Allocator>
131  pair<_InputIter, _ForwardIter>
132  __uninitialized_copy_n_a(_InputIter __first, _Size __count,
133  _ForwardIter __result,
134  _Allocator __alloc)
135  {
136  _ForwardIter __cur = __result;
137  __try
138  {
139  for (; __count > 0 ; --__count, ++__first, ++__cur)
140  __alloc.construct(&*__cur, *__first);
141  return pair<_InputIter, _ForwardIter>(__first, __cur);
142  }
143  __catch(...)
144  {
145  std::_Destroy(__result, __cur, __alloc);
146  __throw_exception_again;
147  }
148  }
149 
150  template<typename _InputIter, typename _Size, typename _ForwardIter,
151  typename _Tp>
152  inline pair<_InputIter, _ForwardIter>
153  __uninitialized_copy_n_a(_InputIter __first, _Size __count,
154  _ForwardIter __result,
155  std::allocator<_Tp>)
156  {
157  return __gnu_cxx::uninitialized_copy_n(__first, __count, __result);
158  }
159 
160  /**
161  * This class provides similar behavior and semantics of the standard
162  * functions get_temporary_buffer() and return_temporary_buffer(), but
163  * encapsulated in a type vaguely resembling a standard container.
164  *
165  * By default, a temporary_buffer<Iter> stores space for objects of
166  * whatever type the Iter iterator points to. It is constructed from a
167  * typical [first,last) range, and provides the begin(), end(), size()
168  * functions, as well as requested_size(). For non-trivial types, copies
169  * of *first will be used to initialize the storage.
170  *
171  * @c malloc is used to obtain underlying storage.
172  *
173  * Like get_temporary_buffer(), not all the requested memory may be
174  * available. Ideally, the created buffer will be large enough to hold a
175  * copy of [first,last), but if size() is less than requested_size(),
176  * then this didn't happen.
177  *
178  * @ingroup SGIextensions
179  */
180  template <class _ForwardIterator, class _Tp
181  = typename std::iterator_traits<_ForwardIterator>::value_type >
182  struct temporary_buffer : public _Temporary_buffer<_ForwardIterator, _Tp>
183  {
184  /// Requests storage large enough to hold a copy of [first,last).
185  temporary_buffer(_ForwardIterator __first, _ForwardIterator __last)
186  : _Temporary_buffer<_ForwardIterator, _Tp>(__first, __last) { }
187 
188  /// Destroys objects and frees storage.
189  ~temporary_buffer() { }
190  };
191 
192 _GLIBCXX_END_NAMESPACE
193 
194 #endif
195